MELBOURNE, AUSTRALIA - JANUARY 20: Angelique Kerber of Germany plays a forehand in her fourth round match against Ekaterina Makarova of Russia during day seven of the 2013 Australian Open at ... more&nbsp

MELBOURNE, AUSTRALIA - JANUARY 20: Angelique Kerber of Germany plays a forehand in her fourth round match against Ekaterina Makarova of Russia during day seven of the 2013 Australian Open at Melbourne Park on January 20, 2013 in Melbourne, Australia. (Photo by Robert Prezioso/Getty Images) less&nbsp